You just need permission from WFaS devs. I think people will have no problem with it since NW has the same animation as WFaS
With Fire and Sword - I was given permission to use WFAS models as a base by the WFAS team (Also the Caribbean devs), i emailed them, they seem to have no problem at all with the models being used in Warband, as evidenced by many other warband mods using their models.https://forums.taleworlds.com/index.php/topic,327745.0.htmlSpoiler(https://i.imgur.com/KOoRTQP.png)[close]
You have to ask for permission before using it and include them in the credits, as far as I know.Your source on this? You could be well be right. But like Wilhelm points out. It is unlikely.